declare const a: number;
declare const b: number;
export const c = a + b;

a + b

a       + b

a ? b : c

var {b = 0} = bar;

function foo(a = 0) { }

a + b
a + ++b
a++ + b
a++ + ++b
a     + b
(a) + (b)
((a)) + ((b))
(((a))) + (((b)))
a + +b
a + (b)
a + +(b)
a + (+(b))
(a + b) + (c + d)
a = b
a ? b : c
var a = b